Portion of a golf club head



FIG. 1 is a bottom perspective view of a portion of a golf club head showing my new design; and,

FIG. 2 is a bottom view thereof.

The broken line immediately surrounding the shaded area represents an unclaimed boundary of the design. The broken line showing of the remainder of the golf club head is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a portion of a golf club head, as shown and described. 